I couldn't find anything, but i'd think a good place to start would be a visit to the museum presently holding the only known 63 mustang (along with a good digital camera). That and i'd buy this, it's a model of the car, would probably help with scaling and general shape when you're doing the body work:http://www.amazon.com/Lindberg-72169.../dp/B001KO0WK8
the finer stuff you'd have to do yourself by looking at the real thing. Who knows, if you do a good enough job with that portion of the job maybe they'll allow you to get a closer look at the 63 so you can complete your replica.

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